MDCAT XII Physics Electromagnetic Lines Online Test-2

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Test Details:

Subject: Physics
Class: 1st year / XII
Chapter Name: Electromagnetic Lines
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

102

Created on April 23, 2025 By

medicoengineer.com

MDCAT XII Physics Electromagnetic Lines Online Test-2

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NameEmailPhone Number

1 / 50

1. Around a magnetic field, magnetic forces are exerted on:

a) Magnets

b) Conductors

c) Charged particles

d) All of these

2 / 50

2. A current-carrying conductor is placed in a magnetic field B as shown in the diagram. In which direction will the conductor move?

a) Right

b) Left

c) Into the plane of the paper

d) Out of the plane of the paper

3 / 50

3. A surface is placed in a magnetic field of 100 T. The total flux through the surface area is 300 Wb. What is the surface area?

a) 0.33 m²

b) 3 m²

c) 30 m²

d) Can’t be determined

4 / 50

4. The concept of magnetic fields is used in:

a) Electric motors

b) Transformers

c) Magnetic compasses

d) All of these

5 / 50

5. An electron is moving with a velocity of 1000 m/s in a magnetic field of 100 T, parallel to the magnetic field. How much force is experienced by the electron?

a) 1.6 × 10⁻¹⁴ N

b) 1.6 × 10⁻¹⁹ N

c) 1.6 × 10⁻¹⁵ N

d) None of these

6 / 50

6. Around a current-carrying conductor:

a) Only magnetic field is produced

b) Only electric field is produced

c) Both electric and magnetic fields are produced

d) Can’t be determined

7 / 50

7. Find the current through a toroid with inner radius 0.1 m, outer radius 0.2 m, and 300 turns, which produces a magnetic field of 4 × 10⁻³ T.

a) 10 A

b) 20 A

c) 100 A

d) 200 A

8 / 50

8. Magnetic force acting on a current-carrying conductor depends on:

a) Current passing through the conductor

b) Length of the conductor

c) Strength of the magnetic field

d) All of these

9 / 50

9. When electric and magnetic forces are equal in a velocity selector, then charged particles:

a) Move towards the magnetic field

b) Move towards the electric field

c) Will move straight in the velocity selector

d) Will come to rest

10 / 50

10. The diagram shows particles moving in a magnetic field directed into the plane of the paper. Which of the following is correct?

a) Diagram-1 (left) shows that the particle is an electron

b) Diagram-1 (left) shows that the particle is an alpha particle

c) Diagram-2 (right) shows that the particle is a neutron

d) Diagram-2 (right) shows that the particle is a proton

11 / 50

11. Magnetic flux is the number of magnetic force lines passing through an area held perpendicular to it.

a) Field, perpendicular

b) Field, parallel

c) Flux, perpendicular

d) Flux, parallel

12 / 50

12. Magnetic force on a particle in a magnetic field is zero when:

a) The charge is at rest

b) The charge is moving perpendicular to the field

c) The charge is moving with uniform velocity

d) A, B, and C

e) Magnetic force on a charged particle in a magnetic field can never be zero

13 / 50

13. What is the magnitude of the magnetic field produced 2 m away from a long straight current-carrying wire carrying a current of 2 A?

a) 1 × 10⁻⁶ T

b) 2 × 10⁻⁶ T

c) 1 × 10⁻⁷ T

d) 2 × 10⁻⁷ T

14 / 50

14. Two particles, one alpha and the other electron, move in the same magnetic field, perpendicular to the magnetic field lines. The alpha particle has half the velocity of the electron. Which of the following is correct?

a) Electron experiences greater force

b) Alpha particle experiences greater force

c) Both particles experience the same force

d) Can’t be determined

15 / 50

15. What is the shape of magnetic field lines produced by a long straight current-carrying conductor?

a) In the direction of current

b) Parallel to the length of the conductor

c) Radially inward towards the wire

d) Concentric circles around the wire

16 / 50

16. A particle is moving with velocity V into the plane of the paper in a magnetic field B directed towards the east, as shown in the diagram. Then the particle is a(n) ------ when it moves ------.

a) Electron, downward

b) Proton, left

c) Neutron, right

d) Alpha, downward

17 / 50

17. Ampere’s law is used for:

a) Closed paths

b) All surfaces

c) Only for straight current-carrying conductors

d) Both A and B

18 / 50

18. A 2 Coulomb charge moving with velocity 2 m/s is experiencing a force of 100 N. What is the magnitude of the magnetic field?

a) 0.5 T

b) 50 T

c) 25 T

d) 2.5 T

19 / 50

19. In the following diagram, blue, green, and red lines show ------ respectively:

a) Electron, neutron, proton

b) Neutron, electron, proton

c) Proton, neutron, electron

d) Electron, proton, neutron

20 / 50

20. There are three charged particles A, B, and C. One particle with charge 2Q is at rest. Another, with charge Q, is moving with velocity v perpendicular to the magnetic field. The third, with charge 3Q, is moving with velocity 2v parallel to the field. Which particle will experience greater magnetic force?

a) The particle with charge 2Q at rest

b) The particle with charge Q moving with velocity v

c) The particle with charge 3Q moving with velocity 2v

d) Can’t be determined

21 / 50

21. The magnetic field of induction has the same unit as:

a) Magnetic flux

b) Magnetic flux density

c) Both A and B

d) None of these

22 / 50

22. The unit of magnetic flux is:

a) N/mA

b) Nm·A

c) Nm/A

d) None of these

23 / 50

23. Magnetic flux density at a specific point is ------ along a straight conductor carrying unit current placed perpendicular to the field.

a) Force per unit length

b) Force per unit area

c) Force per unit volume

d) Can’t be determined

24 / 50

24. Which of the following is/are applications of Ampere’s law?

a) MRI machine

b) Transformer

c) Solenoid

d) All of these

25 / 50

25. Magnetic field lines inside a toroid are ------ and ------.

a) Straight, concentrated inside and outside of the coil

b) Straight, concentrated within the coil

c) Circular, concentrated inside and outside of the coil

d) Circular, concentrated within the coil

26 / 50

26. Inside the magnet, the direction of the magnetic field is from ---------- to ----------.

a) South pole, north pole

b) North pole, south pole

c) Either A or B

d) Can’t be determined

27 / 50

27. To measure e/m of an electron, which field is used?

a) Magnetic

b) Electric

c) Both magnetic and electric

d) No field is used for measuring e/m of an electron

28 / 50

28. To convert a galvanometer into an ammeter, a -------- resistor is connected in -------- to the galvanometer.

a) High, series

b) Low, parallel

c) High, parallel

d) Low, series

29 / 50

29. If the direction of electric current is reversed, then the direction of the magnetic field:

a) Remains the same

b) Changes

c) May remain the same or change

d) Can’t be determined

30 / 50

30. If the charge on a particle is halved and the velocity of the charge is doubled, then the magnetic force on the particle:

a) Doubled

b) Halved

c) Remains the same

d) Can’t be determined

31 / 50

31. What is the direction of the magnetic force on the particle?

a) Right

b) Left

c) Inward

d) Outward

32 / 50

32. A charged particle moves along the magnetic field lines in a magnetic field. The magnetic force on the electron:

a) Depends on the charge

b) Depends on the velocity

c) Depends on both charge and velocity of the charged particle

d) Is zero

33 / 50

33. A proton and an alpha particle move in the same magnetic field, perpendicular to the magnetic field lines with the same velocity. Which exerts greater force?

a) Proton

b) Alpha particle

c) Both exert equal force

d) Can’t be determined

34 / 50

34. Which of the following is correct regarding the following diagram?

a) Flux through the surface is minimum because the area vector is parallel to the magnetic field

b) Flux through the surface is maximum because the area vector is parallel to the magnetic field

c) Flux through the surface is minimum because the area vector is perpendicular to the magnetic field

d) Flux through the surface is maximum because the area vector is perpendicular to the magnetic field

35 / 50

35. The parallel current-carrying wires -------- each other and antiparallel current-carrying wires -------- each other.

a) Repel, attract

b) Attract, repel

c) Attract, attract

d) Repel, repel

36 / 50

36. For the magnetic force to act upon a particle, what condition is not necessary?

a) Particle should be charged

b) Particle should be moving

c) Force should be perpendicular to magnetic field

d) None of these

37 / 50

37. Magnetic force, unlike electric force, is:

a) Only attractive in nature

b) Only repulsive in nature

c) Both attractive and repulsive in nature

d) Only acts on charged particles

38 / 50

38. A current of 500 A is passing through a solenoid of 3.14 m length with 100 turns. What is the magnitude of the magnetic field produced inside the solenoid?

a) 0.01

b) 0.02

c) 0.1

d) 0.2

39 / 50

39. A current-carrying wire is placed vertically as shown in the diagram. What is the direction of the magnetic field at point M?

a) Right

b) Left

c) Inward

d) Outward

40 / 50

40. Which of the following will not be deflected in a magnetic field?

a) X-rays

b) Gamma rays

c) UV rays

d) All of these

41 / 50

41. In a magnetic field of 2 T, a wire carrying 10 A current is placed at an angle of 60° with the magnetic field. What will be the magnetic force on the wire?

a) 10

b) 20

c) 30

d) none of these

42 / 50

42. A current-carrying wire produces a magnetic field:

a) Only when current is passing through itaA current-carrying wire produces a magnetic field:

b) Also after removing current from it for a few seconds

c) Also when no current is moving in it

d) Both A and B

43 / 50

43. Magnetic flux is measured in:

a) Weber/m²

b) Weber·m²

c) Weber·m

d) Weber

44 / 50

44. Direction of the magnetic field inside a solenoid is:

a) North to south

b) South to north

c) Either A or B

d) Magnetic field of solenoid can’t be determined

45 / 50

45. A galvanometer is used to detect and measure:

a) Voltage

b) Charge

c) Current

d) All of these

46 / 50

46. A current-carrying wire produces a magnetic field of 2×10^-5 T at 2 cm away from the wire. What is the magnitude of current in the wire?

a) 0.16 A

b) 0.32 A

c) 1 A

d) 2 A

47 / 50

47. When a charged particle is moving in a region of magnetic field perpendicular to it, which of the following parameters will remain constant?

a) Speed

b) Velocity

c) Acceleration

d) Both A and B

48 / 50

48. A negatively charged particle is moving in a magnetic field B with velocity V as shown in the diagram. In which direction will the magnetic force act?